“∫ ” 是什么符号啊，是数学符号吗？有什么作用啊？请详细讲讲。谢谢
\u2211\u6570\u5b66\u7b26\u53f7\u7684\u8be6\u7ec6\u7528\u6cd5\u662f\u8fde\u52a0\u7684\u542b\u4e49,\u5c31\u662f\u628a\u7b26\u53f7\u540e\u89c4\u5b9a\u7684\u6570\u5168\u90e8\u52a0\u8d77\u6765
\u3000\u3000\u6570\u5b66\u7b26\u53f7\u4e00\u822c\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a
\u3000\u3000\uff081\uff09\u6570\u91cf\u7b26\u53f7\uff1a\u5982 :i\uff0c2\uff0b i\uff0ca\uff0cx\uff0c\u81ea\u7136\u5bf9\u6570\u5e95e\uff0c\u5706\u5468\u7387 \u220f\u3002
\u3000\u3000\uff082\uff09\u8fd0\u7b97\u7b26\u53f7\uff1a\u5982\u52a0\u53f7\uff08+\uff09\uff0c\u51cf\u53f7\uff08-\uff09\uff0c\u4e58\u53f7\uff08\u00d7\u6216\u00b7\uff09\uff0c\u9664\u53f7\uff08\u00f7\u6216\uff0f\uff09\uff0c\u4e24\u4e2a\u96c6\u5408\u7684\u5e76\u96c6\uff08\u222a\uff09\uff0c\u4ea4\u96c6\uff08\u2229\uff09\uff0c\u6839\u53f7\uff08 \uff09\uff0c\u5bf9\u6570\uff08log\uff0clg\uff0cln\uff09\uff0c\u6bd4\uff08\u2236\uff09\uff0c\u5fae\u5206\uff08d\uff09\uff0c\u79ef\u5206\uff08\u222b\uff09\u7b49\u3002
\u3000\u3000\uff083\uff09\u5173\u7cfb\u7b26\u53f7\uff1a\u5982\u201c=\u201d\u662f\u7b49\u53f7\uff0c\u201c\u2248\u201d\u6216\u201c \u201d\u662f\u8fd1\u4f3c\u7b26\u53f7\uff0c\u201c\u2260\u201d\u662f\u4e0d\u7b49\u53f7\uff0c\u201c\uff1e\u201d\u662f\u5927\u4e8e\u7b26\u53f7\uff0c\u201c\uff1c\u201d\u662f\u5c0f\u4e8e\u7b26\u53f7\uff0c\u201c \u201d\u8868\u793a\u53d8\u91cf\u53d8\u5316\u7684\u8d8b\u52bf\uff0c\u201c\u223d\u201d\u662f\u76f8\u4f3c\u7b26\u53f7\uff0c\u201c\u224c\u201d\u662f\u5168\u7b49\u53f7\uff0c\u201c\u2016\u201d\u662f\u5e73\u884c\u7b26\u53f7\uff0c\u201c\u22a5\u201d\u662f\u5782\u76f4\u7b26\u53f7\uff0c\u201c\u221d\u201d\u662f\u6b63\u6bd4\u4f8b\u7b26\u53f7\uff0c\u201c\u2208\u201d\u662f\u5c5e\u4e8e\u7b26\u53f7\u7b49\u3002
\u3000\u3000\uff084\uff09\u7ed3\u5408\u7b26\u53f7\uff1a\u5982\u5706\u62ec\u53f7\u201c\uff08\uff09\u201d\u65b9\u62ec\u53f7\u201c[]\u201d\uff0c\u82b1\u62ec\u53f7\u201c{}\u201d\u62ec\u7ebf\u201c\u2014\u201d
\u3000\u3000\uff085\uff09\u6027\u8d28\u7b26\u53f7\uff1a\u5982\u6b63\u53f7\u201c+\u201d\uff0c\u8d1f\u53f7\u201c-\u201d\uff0c\u7edd\u5bf9\u503c\u7b26\u53f7\u201c\u2016\u201d
\u3000\u3000\uff086\uff09\u7701\u7565\u7b26\u53f7\uff1a\u5982\u4e09\u89d2\u5f62\uff08\u25b3\uff09\uff0c\u6b63\u5f26\uff08sin\uff09\uff0cX\u7684\u51fd\u6570\uff08f(x)\uff09\uff0c\u6781\u9650\uff08lim\uff09\uff0c\u56e0\u4e3a\uff08\u2235\uff09\uff0c\u6240\u4ee5\uff08\u2234\uff09\uff0c\u603b\u548c\uff08\u2211\uff09\uff0c\u8fde\u4e58\uff08\u220f\uff09\uff0c\u4eceN\u4e2a\u5143\u7d20\u4e2d\u6bcf\u6b21\u53d6\u51faR\u4e2a\u5143\u7d20\u6240\u6709\u4e0d\u540c\u7684\u7ec4\u5408\u6570\uff08C \uff09\uff0c\u5e42\uff08aM\uff09\uff0c\u9636\u4e58\uff08\uff01\uff09\u7b49\u3002
\u3000\u3000\u7b26\u53f7 \u610f\u4e49
\u3000\u3000\u221e \u65e0\u7a77\u5927
\u3000\u3000PI \u5706\u5468\u7387
\u3000\u3000|x| \u51fd\u6570\u7684\u7edd\u5bf9\u503c
\u3000\u3000\u222a \u96c6\u5408\u5e76
\u3000\u3000\u2229 \u96c6\u5408\u4ea4
\u3000\u3000\u2265 \u5927\u4e8e\u7b49\u4e8e
\u3000\u3000\u2264 \u5c0f\u4e8e\u7b49\u4e8e
\u3000\u3000\u2261 \u6052\u7b49\u4e8e\u6216\u540c\u4f59
\u3000\u3000ln(x) \u4ee5e\u4e3a\u5e95\u7684\u5bf9\u6570
\u3000\u3000lg(x) \u4ee510\u4e3a\u5e95\u7684\u5bf9\u6570
\u3000\u3000floor(x) \u4e0a\u53d6\u6574\u51fd\u6570
\u3000\u3000ceil(x) \u4e0b\u53d6\u6574\u51fd\u6570
\u3000\u3000x mod y \u6c42\u4f59\u6570
\u3000\u3000{x} \u5c0f\u6570\u90e8\u5206 x - floor(x)
\u3000\u3000\u222bf(x)\u03b4x \u4e0d\u5b9a\u79ef\u5206
\u3000\u3000\u222b[a:b]f(x)\u03b4x a\u5230b\u7684\u5b9a\u79ef\u5206
\u3000\u3000P\u4e3a\u771f\u7b49\u4e8e1\u5426\u5219\u7b49\u4e8e0
\u3000\u3000\u2211[1\u2264k\u2264n]f(k) \u5bf9n\u8fdb\u884c\u6c42\u548c,\u53ef\u4ee5\u62d3\u5e7f\u81f3\u5f88\u591a\u60c5\u51b5
\u3000\u3000\u5982\uff1a\u2211[n is prime][n < 10]f(n)
\u3000\u3000\u2211\u2211[1\u2264i\u2264j\u2264n]n^2
\u3000\u3000lim f(x) (x->?) \u6c42\u6781\u9650
\u3000\u3000f(z) f\u5173\u4e8ez\u7684m\u9636\u5bfc\u51fd\u6570
\u3000\u3000C(n:m) \u7ec4\u5408\u6570,n\u4e2d\u53d6m
\u3000\u3000P(n:m) \u6392\u5217\u6570
\u3000\u3000m|n m\u6574\u9664n
\u3000\u3000m\u22a5n m\u4e0en\u4e92\u8d28
\u3000\u3000a \u2208 A a\u5c5e\u4e8e\u96c6\u5408A
\u3000\u3000#A \u96c6\u5408A\u4e2d\u7684\u5143\u7d20\u4e2a\u6570
\u3000\u3000\u56de\u7b54\u8005\uff1atzzjh - \u52a9\u7406 \u4e8c\u7ea7 11-9 10:49
\u3000\u3000--------------------------------------------------------------------------------
\u3000\u3000\uff081\uff09\u6570\u91cf\u7b26\u53f7
\u3000\u3000\uff082\uff09\u8fd0\u7b97\u7b26\u53f7\uff1a\u5982\u52a0\u53f7\uff08+\uff09\uff0c\u51cf\u53f7\uff08-\uff09\uff0c\u4e58\u53f7\uff08\u00d7\u6216\u00b7\uff09\uff0c\u9664\u53f7\uff08\u00f7\u6216\uff0f\uff09\uff0c\u4e24\u4e2a\u96c6\u5408\u7684\u5e76\u96c6\uff08\u222a\uff09\uff0c\u4ea4\u96c6\uff08\u2229\uff09\uff0c\u6839\u53f7\uff08 \uff09\uff0c\u5bf9\u6570\uff08log\uff0clg\uff0cln\uff09\uff0c\u6bd4\uff08\u2236\uff09\u7b49\u3002
\u3000\u3000\uff083\uff09\u5173\u7cfb\u7b26\u53f7\uff1a\u5982\u201c=\u201d\u662f\u7b49\u53f7\uff0c\u201c\u2248\u201d\u6216\u201c \u201d\u662f\u8fd1\u4f3c\u7b26\u53f7\uff0c\u201c\u2260\u201d\u662f\u4e0d\u7b49\u53f7\uff0c\u201c\uff1e\u201d\u662f\u5927\u4e8e\u7b26\u53f7\uff0c\u201c\uff1c\u201d\u662f\u5c0f\u4e8e\u7b26\u53f7\uff0c\u201c \u201d\u8868\u793a\u53d8\u91cf\u53d8\u5316\u7684\u8d8b\u52bf\uff0c\u201c\u223d\u201d\u662f\u76f8\u4f3c\u7b26\u53f7\uff0c\u201c\u224c\u201d\u662f\u5168\u7b49\u53f7\uff0c\u201c\u2016\u201d\u662f\u5e73\u884c\u7b26\u53f7\uff0c\u201c\u22a5\u201d\u662f\u5782\u76f4\u7b26\u53f7\uff0c\u201c\u221d\u201d\u662f\u6b63\u6bd4\u4f8b\u7b26\u53f7\uff0c\u201c\u2208\u201d\u662f\u5c5e\u4e8e\u7b26\u53f7\u7b49\u3002
\u3000\u3000\uff084\uff09\u7ed3\u5408\u7b26\u53f7\uff1a\u5982\u5706\u62ec\u53f7\u201c\uff08\uff09\u201d\u65b9\u62ec\u53f7\u201c[]\u201d\uff0c\u82b1\u62ec\u53f7\u201c{}\u201d\u62ec\u7ebf\u201c\u2014\u201d
\u3000\u3000\uff085\uff09\u6027\u8d28\u7b26\u53f7\uff1a\u5982\u6b63\u53f7\u201c+\u201d\uff0c\u8d1f\u53f7\u201c-\u201d\uff0c\u7edd\u5bf9\u503c\u7b26\u53f7\u201c\u2016\u201d
\u3000\u3000\uff086\uff09\u7701\u7565\u7b26\u53f7\uff1a\u5982\u4e09\u89d2\u5f62\uff08\u25b3\uff09\uff0c\u6b63\u5f26\uff08sin\uff09\uff0cX\u7684\u51fd\u6570\uff08f(x)\uff09\uff0c\u6781\u9650\uff08lim\uff09\uff0c\u56e0\u4e3a\uff08\u2235\uff09\uff0c\u6240\u4ee5\uff08\u2234\uff09\uff0c\u603b\u548c\uff08\u2211\uff09\uff0c\u8fde\u4e58\uff08\u220f\uff09\uff0c\u4eceN\u4e2a\u5143\u7d20\u4e2d\u6bcf\u6b21\u53d6\u51faR\u4e2a\u5143\u7d20\u6240\u6709\u4e0d\u540c\u7684\u7ec4\u5408\u6570\uff08C \uff09\uff0c\u5e42\uff08aM\uff09\uff0c\u9636\u4e58\uff08\uff01\uff09\u7b49\u3002
\u3000\u3000\u7b26\u53f7 \u610f\u4e49
\u3000\u3000\u221e \u65e0\u7a77\u5927
\u3000\u3000PI \u5706\u5468\u7387
\u3000\u3000|x| \u51fd\u6570\u7684\u7edd\u5bf9\u503c
\u3000\u3000\u222a \u96c6\u5408\u5e76
\u3000\u3000\u2229 \u96c6\u5408\u4ea4
\u3000\u3000\u2265 \u5927\u4e8e\u7b49\u4e8e
\u3000\u3000\u2264 \u5c0f\u4e8e\u7b49\u4e8e
\u3000\u3000\u2261 \u6052\u7b49\u4e8e\u6216\u540c\u4f59
\u3000\u3000ln(x) \u4ee5e\u4e3a\u5e95\u7684\u5bf9\u6570
\u3000\u3000lg(x) \u4ee510\u4e3a\u5e95\u7684\u5bf9\u6570
\u3000\u3000floor(x) \u4e0a\u53d6\u6574\u51fd\u6570
\u3000\u3000ceil(x) \u4e0b\u53d6\u6574\u51fd\u6570
\u3000\u3000x mod y \u6c42\u4f59\u6570
\u3000\u3000{x} \u5c0f\u6570\u90e8\u5206 x - floor(x)
\u3000\u3000\u222bf(x)\u03b4x \u4e0d\u5b9a\u79ef\u5206
\u3000\u3000\u222b[a:b]f(x)\u03b4x a\u5230b\u7684\u5b9a\u79ef\u5206
\u3000\u3000P\u4e3a\u771f\u7b49\u4e8e1\u5426\u5219\u7b49\u4e8e0
\u3000\u3000\u2211[1\u2264k\u2264n]f(k) \u5bf9n\u8fdb\u884c\u6c42\u548c,\u53ef\u4ee5\u62d3\u5e7f\u81f3\u5f88\u591a\u60c5\u51b5
\u3000\u3000\u5982\uff1a\u2211[n is prime][n < 10]f(n)
\u3000\u3000\u2211\u2211[1\u2264i\u2264j\u2264n]n^2
\u3000\u3000lim f(x) (x->?) \u6c42\u6781\u9650
\u3000\u3000f(z) f\u5173\u4e8ez\u7684m\u9636\u5bfc\u51fd\u6570
\u3000\u3000C(n:m) \u7ec4\u5408\u6570,n\u4e2d\u53d6m
\u3000\u3000P(n:m) \u6392\u5217\u6570
\u3000\u3000m|n m\u6574\u9664n
\u3000\u3000m\u22a5n m\u4e0en\u4e92\u8d28
\u3000\u3000a \u2208 A a\u5c5e\u4e8e\u96c6\u5408A
\u3000\u3000#A \u96c6\u5408A\u4e2d\u7684\u5143\u7d20\u4e2a\u6570
\u3000\u3000\u53f7 \u610f\u4e49
\u3000\u3000\u221e \u65e0\u7a77\u5927
\u3000\u3000PI \u5706\u5468\u7387
\u3000\u3000|x| \u51fd\u6570\u7684\u7edd\u5bf9\u503c
\u3000\u3000\u222a \u96c6\u5408\u5e76
\u3000\u3000\u2229 \u96c6\u5408\u4ea4
\u3000\u3000\u2265 \u5927\u4e8e\u7b49\u4e8e
\u3000\u3000\u2264 \u5c0f\u4e8e\u7b49\u4e8e
\u3000\u3000\u2261 \u6052\u7b49\u4e8e\u6216\u540c\u4f59
\u3000\u3000ln(x) \u4ee5e\u4e3a\u5e95\u7684\u5bf9\u6570
\u3000\u3000lg(x) \u4ee510\u4e3a\u5e95\u7684\u5bf9\u6570
\u3000\u3000floor(x) \u4e0a\u53d6\u6574\u51fd\u6570
\u3000\u3000ceil(x) \u4e0b\u53d6\u6574\u51fd\u6570
\u3000\u3000x mod y \u6c42\u4f59\u6570
\u3000\u3000{x} \u5c0f\u6570\u90e8\u5206 x - floor(x)
\u3000\u3000\u222bf(x)\u03b4x \u4e0d\u5b9a\u79ef\u5206
\u3000\u3000\u222b[a:b]f(x)\u03b4x a\u5230b\u7684\u5b9a\u79ef\u5206
\u3000\u3000P\u4e3a\u771f\u7b49\u4e8e1\u5426\u5219\u7b49\u4e8e0
\u3000\u3000\u2211[1\u2264k\u2264n]f(k) \u5bf9n\u8fdb\u884c\u6c42\u548c,\u53ef\u4ee5\u62d3\u5e7f\u81f3\u5f88\u591a\u60c5\u51b5
\u3000\u3000\u5982\uff1a\u2211[n is prime][n < 10]f(n)
\u3000\u3000\u2211\u2211[1\u2264i\u2264j\u2264n]n^2
\u3000\u3000lim f(x) (x->?) \u6c42\u6781\u9650
\u3000\u3000f(z) f\u5173\u4e8ez\u7684m\u9636\u5bfc\u51fd\u6570
\u3000\u3000C(n:m) \u7ec4\u5408\u6570,n\u4e2d\u53d6m
\u3000\u3000P(n:m) \u6392\u5217\u6570
\u3000\u3000m|n m\u6574\u9664n
\u3000\u3000m\u22a5n m\u4e0en\u4e92\u8d28
\u3000\u3000a \u2208 A a\u5c5e\u4e8e\u96c6\u5408A
\u3000\u3000#A \u96c6\u5408A\u4e2d\u7684\u5143\u7d20\u4e2a\u6570
你看看高数书吧，一看就明白了！积分规则一时怎么可能说明白
当时学的时候当重点讲的讲了两周呢！
比如一个函数给你了，让你求它的积分，这个就叫积分，给你范围是0到1，那么你就对这个函数积分
在xy图里面是积出来的是0到1的面积，呵呵！
是积是分符号！是莱布尼茨发明的！是和微分对立的！高等数学书上有！
是积是分符号！是莱布尼茨发明的！是和微分对立的！高等数学书上有
是积分的意思
扩展阅读：符号图标logo大全 ... ∈什么意思 ... ∧是什么符号 ... ∫音标发音 ... 标点符号大全 ... 女生发 这个符号什么意思 ... 点符号丶大全 ... &符号含义 ... 男女标志符号大全 ...
